In the northern hemisphere, summer begins today.
Summer will perform at 4.59pm, and at the same time winter begins for the inhabitants of the southern Hemisphere. At the beginning of summer, daylight is the longest and the night is the shortest.
The first day of summer is considered the day of the summer solstice, which usually falls between June 20 and 23. As the Earth revolves around the Sun, but also around its axis, its position at a certain point in relation to the Sun is defined by the seasons.
This year the autumn equinox (equinox) is September 23, which means that summer ends and autumn begins.